android - 获取位置并发送短信

Question

下面的代码给了我手机的位置，但没有发送消息。

当我在位置管理器减速之前给出短信代码时，它会在尝试之前发送短信。

try{

    LocationManager locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE);

    // Define a listener that responds to location updates
    LocationListener locationListener = new LocationListener() {
        String message;
         public void onLocationChanged(Location location) {
         // Called when a new location is found by the network location provider.
         String loc=location.toString();
       // Toast.makeText(getApplicationContext(), loc,Toast.LENGTH_LONG).show();
         String  phoneNumber="5556";
         message="this is amog and it is my current location "+loc;
         sendSMS(phoneNumber, message);
         Toast.makeText(getApplicationContext(), message,Toast.LENGTH_LONG).show();
         sendSMS(phoneNumber, message);

         }    

    public void onStatusChanged(String provider, int status, Bundle extras) {}

    public void onProviderEnabled(String provider) {}

    public void onProviderDisabled(String provider) {}

};



    // Register the listener with the Location Manager to receive location updates
    locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
    }catch(Exception e){
        Toast.makeText(getApplicationContext(), e.getMessage(),Toast.LENGTH_LONG).show();
    }